Consider a labour market in which the supply curve is given by: w= 10 + Ls (where w is the wage rate and Ls is the quantity of labour supplied). Further, assume that the demand for labour is given by w = 100 - Ld (where w is the wage rate and Ld is the quantity of labour demanded). Assume that the government imposes a minimum wage of 50. In this case the resulting deadweight loss is equal to?